The operating system must block both inbound and outbound traffic between instant messaging clients, independently configured by end users and external service providers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-48219	SOL-11.1-050350	SV-61091r1_rule		Medium

Description
Proper configuration of the firewall will deny instant messaging clients which will reduce a user's ability to relay sensitive information.

STIG	Date
Solaris 11 SPARC Security Technical Implementation Guide	2017-03-02

Details

Check Text ( C-50651r1_chk )
The IP Filter Management profile is required. Check that the IP Filter firewall is enabled and configured so that only encrypted SSH sessions are allowed. # svcs ipfilter If ipfilter is not listed with a state of online, this is a finding. The IP Filter Management profile is required. Check that the filters are configured properly. # ipfstat -io If the output of this command does not include these lines: block out log all keep state keep frags pass in log quick proto tcp from any to any port = ssh keep state block in log all block in log from any to 255.255.255.255/32 block in log from any to 127.0.0.1/32 this is a finding. Even if the lines above are included in the output, it is possible that other lines can contradict the firewall settings. Review the firewall rules and ensure that they conform to organizational and mission requirements. If the firewall rules are not configured to organizational standards, this is a finding.

Check Text ( C-50651r1_chk )

The IP Filter Management profile is required.

Check that the IP Filter firewall is enabled and configured so that only encrypted SSH sessions are allowed.

# svcs ipfilter

If ipfilter is not listed with a state of online, this is a finding.

The IP Filter Management profile is required.

Check that the filters are configured properly.

# ipfstat -io

If the output of this command does not include these lines:

block out log all keep state keep frags
pass in log quick proto tcp from any to any port = ssh keep state
block in log all
block in log from any to 255.255.255.255/32
block in log from any to 127.0.0.1/32

this is a finding.

Even if the lines above are included in the output, it is possible that other lines can contradict the firewall settings. Review the firewall rules and ensure that they conform to organizational and mission requirements. If the firewall rules are not configured to organizational standards, this is a finding.

Fix Text (F-51827r1_fix)
The root role is required. Configure and enable the IP Filters policy. # pfedit /etc/ipf/ipf.conf. Add these lines to the file: # Allow SSH (note you cannot restrict to SSHv2 here. This can # only be done in /etc/ssh/sshd_config.) pass in log quick proto tcp from any to any port = 22 keep state # Do not allow all outbound traffic, keep state, and log block out log all keep state keep frags # Block and log everything else that comes in block in log all block in log from any to 255.255.255.255 block in log from any to 127.0.0.1/32 Enable ipfilter. # svcadm enable ipfilter Notify ipfilter to use the new configuration file. # ipf -Fa -f /etc/ipf/ipf.conf Note: This is an extremely strict firewall policy disabling all network traffic except incoming SSH (port 22) connections. Operational requirements may dictate the addition of other protocols such as DNS, NTP, HTTP, and HTTPS to be allowed.

Fix Text (F-51827r1_fix)

The root role is required.

Configure and enable the IP Filters policy.

# pfedit /etc/ipf/ipf.conf.

Add these lines to the file:

# Allow SSH (note you cannot restrict to SSHv2 here. This can
# only be done in /etc/ssh/sshd_config.)
pass in log quick proto tcp from any to any port = 22 keep state
# Do not allow all outbound traffic, keep state, and log
block out log all keep state keep frags
# Block and log everything else that comes in
block in log all
block in log from any to 255.255.255.255
block in log from any to 127.0.0.1/32

Enable ipfilter.

# svcadm enable ipfilter

Notify ipfilter to use the new configuration file.

# ipf -Fa -f /etc/ipf/ipf.conf

Note: This is an extremely strict firewall policy disabling all network traffic except incoming SSH (port 22) connections. Operational requirements may dictate the addition of other protocols such as DNS, NTP, HTTP, and HTTPS to be allowed.